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    Dynamic Liquid-Liquid Interface: Applying a Spinning Interfacial Microreactor to Actively Converge Biphasic Reactants for the Enhanced Interfacial Reaction

    Journal: ACS Appl. Mater. Interfaces

    Authors: Ng, Li Shiuan; Chong, Carice; Lok, Xin Yi; Pereira, Veronica; Ang, Zhi Zhong; Han, Xuemei; Li, Haitao; Lee, Hiang Kwee

    Organizations: Singapore Ministry of Education (AcRF Tier 1) [RS13/20, RG4/21]; A*STAR Singapore (AME YIRG) [A2084c0158]; Nanyang Technological University; Nanyang Technological University (NTU) [REQ0275931]; Institute of Materials Research and Engineering (IMRE) from Agency for Science, Technology and Research (A*STAR) [REQ0275931]

    Keywords: biphasic reaction; dynamic microreactor; liquid-liquid interface; liquid marble; molecule transport

    A liquid-liquid interfacial reaction combines reactants with large polarity disparity to achieve greener and more efficient chemistry that is otherwise challenging in traditional single-phase systems. However, current interfacial approaches suffer from the need for a large amount of solvent/reactant/emulsifier and poor reaction performance arising from intrinsic thermodynamic constraints. Herein, we achieve an efficient interfacial reaction by creating a magnetic-responsive, microscale liquid-liquid interface and exploit its dynamic spinning motion to generate vortex-like hydrodynamic flows that rapidly converge biphasic reactants to the point-of-reaction. Notably, the spinning of this functional interface at 800 rpm boosts the reaction efficiency and its apparent equilibrium constant by > 500-fold and 10(5)-fold, respectively, higher than conventional methods that utilize bulk and/or non-dynamic liquid interfaces, even with external mechanical stirring. By driving reaction equilibrium toward favorable product formation, our unique design offers enormous opportunities to realize efficient multiphasic reactions crucial for diverse applications in chemical synthesis, environmental remediation, and even molecular recycling.
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